Tensioning stirrup for lower aprons of drawing systems in textile spinning machines



July 12, 1960 AMPL W. H TENSIONING STIRRUP FOR LOWER SYSTEMS IN TEXTILE SPINNI Filed March 20, 1957 ONS MAC

2,944,299 OF DRAWING HINES 2 Sheets-Sheet l July 12, 1960 w. HAMPL 2,944,299

TENSIONING STIRRUP FOR LOWER APRONS OF DRAWING SYSTEMS IN TEXTILE SPINNING MACHINES Filed March 20, 1957 2 Sheets-Sheet 2 Fla. 7

Units S at r i i, Peitented Jul rz, 19cc 2,944,299 TENSIONING STIRRUP non rowan 'APRONS or DRAWING SYSTEMS "IN TEXTILE "SPINNING MACHINES A I Walter Hampl, Friedensstrasse 40,1Murrliardt, Germany 'Filed'Mar. 20, 1951, Ser. No. 641,243

9 Claims. (Cl. 19-131) hazardfof. one-sided bearing against the apron, ifthe Fig. f3 is a part sectional elevati 11 taken along the lines 3-3. of Fig. 1 and showing the leaf springsupport';

Fig. 4 is a sectional view through the leaf spring sup: port in which the leaf spring isin engagement with the longitudinal groove or slotin 'a tube drawn tightly on thecarrierbar; v I

Fig. Sis a perspective top view of a tensioning stirrup having an opening for admittin'g the endless apron, and

, wherein the stirrup has a guidemember formedinte- Fig. 6 ,is'a vie'w similar toFig. 5 but showing the ten-.

sionin'g stirrup being provided with a cover for the'leaf l Fig. Tie a sectional view taken along the lines 7-}7 of Fig.'8; and 'f Y 1 Fig. 8 is atop plan view of the tensioning stirrup con structed in accordancewith the present invention.

springs are not very accurately mounted on their carrier bar. This results in sidewandering, nonuniform draw} .ing and speedy Wearof the'aprons. It further known to tension a turnably'rnounted stirrup by means ofa coil spring. Such an arrangement is insecure and, in addi- 4 1 tion, the spring is susceptible to collection of'fiy. D

It is, therefore the main object of thefpresent invention to overcome the above "drawbacks by providing a spring-loaded tensioning stirrup for tensioning the lower aprons in drawing systems of spinning machines 'which is simple and practical in construction, strong and. reliable in use, relatively inexpensive to manufacture, and otherwise well adapted for the purpose for which the same is intended.

It is another object of the present invention to provide a. wide leaf spring whose one end embraces a carrier bar and engages a longitudinal groove or slot provided therein, whereas the other end of the wide leaf spring extends exactly parallely or nearly so with respect to the longitudinal side edges of the tensioning stirrup and bears with tension against a cross-member thereof extending between the carrier bar and the guide member of the tensioning stirrup.

It is yet another object of the present invention to provide a leafspring by forming the longitudinal groove or slot in the carrier bar indirectly in that a tube provided with a suitable longitudinal slot for engaging the leaf spring is drawn tightly on the carrier bar.

A still further improvement of the structure of the invention resides in the feature that the leaf spring is protected against fly and dust by a cover attached to the tensioning stirrup and covering the leaf spring like a roof.

A furtherfeature of advantage of the structure of the invention resides in having the carrier bar arranged turnably about its axis, so that the leaf springs for an entire side of the machine may be adjusted simultaneously by means of adjusting levers mounted on the carrier bar. Adjusting may be eliected. by means of screws abuttin against the frame of the machine.

With these and other objects in view which will become apparent in the following detailed description, the present invention will be clearly understood in connection with the accompanying drawings, in which:

Figure 1 is a sectional view through an apron guide;

Fig. 2. is a top perspective view of the guide shown in Fig. 1;

Referring now to. the drawings,ja'nd in particular to Figsi l to 3', it will beseen that the tensioning device com prisesf aleaf spring 1, having ends 2 and 3, and a stirrup f3 havinga cross-member 5 and a transversely extending guide-member 6. The median portion ofthe leaf spring 1V is" curled and embraces the carrier bar 8 provided with alongitudinal groove or slot' 7, whereas theend 2 of the lea'f spring bears with tension against the cross-member 5 of the stirrup'4, and the oifset. end 30f theleaflspring 1 is in. engagement with the groove or slot 7." The" endless apron 9' is placed aroundcross-member 6, driven draw ing roller. 10' and guide member 1 1. The drawing roller 12 pressesjthe slubbing member 13against the apron 9',

as "is clearly seen. in l. The leaf spring 1 is ten,-

sio'ned so that theapron '9 is resiliently tensioned by the stirrup 4. The cross-member 5 of thestirrup 4 is made integrally therewith, whereas the guide-member 6 is ;reuiovablyarranged therein. The carrier "bar 8 is' turnable about its axis and has levers 14 1igidly mounted thereon and, each lever 14. hasa screw15in threaded engagement therewith whose lower endabuts against the .wall 16 of the frame of the spinning. machine. Thus the tension of the apron. 9 isrnade adjustable by the screws 15.

In the structure of the invention illustrated in Fig. 4 the offset end17 ofthe spring .18 is in. engagement with the longitudinal-slot: 19 formed by the carrier bar 8 and a longitudinally slotted'tube 20, the latter being rigidly secured to the carrier bar 8. v The end 21 of the blade spring 17 bears with tension against the cross-member 5.

In the structure of the invention illustrated in Fig. 5, the guide-member 22 is made of metal and a rigid member of the stirrup 23 made, for example, of thermosetting plastics. The end 2 of the leaf spring bears with tension against the cross-member 24 of the stirrup 23. A lateral opening is provided in the stirrup 23 for admitting the endless apron.

In the structure of the invention illustrated in Fig. 6

the leaf spring portion 2 is roofed over by a cover 25 of the stirrup 26 which according to Figs. 7 and 8 is together with its cover 25 and cross-member 27 and 28 made integrally of thermosetting plastics.

It is thought from the foregoing description that the advantages and novel features of the invention will be readily apparent.

While I have disclosed two embodiments of the present invention, it is to be understood that these embodiments are given by example only and not in a limiting sense, the scope of the present invention being determined by the objects and'the claims.

1 claim: a g

1. A device for tensioning the lower aprons of drawing systems in textile spinning machines having a frame, comprising a tensioning stirrup having a transversely extending guide member removably arranged therein and a' rigid cross-member and being turnably mounted on a carrier baf extending longitudinally with respect to the spinning machine, a longitudinal groove in said carrier bar,,a wideleaf spring extending substantiallyparallel -withrespect to" the longitudinal edges of said' stirrup, said leaf spring having a center portion as well as an inner and outer portion, and saidcenter portion'bein-g curled and embracing said carrier bar and said inner portion being offset for engagement with said longitudinal groove and said outer portion bearing with tension against said cross-member of said stirrup in order to tension said stirrup and, thereby, said aprons.

' 2. The tensioning device, as set forth in claim 1, wherein said carrier bar is mounted on said machines so as to be turntable about its axis and having levers rigidly mounted thereon, and each of said levers having a screw in threaded engagement therewith, the lowerend of said screw abutting against said frame of the machines in order to enable adjustment of the tensioning of said aprons.

3. A device for tensioning the lower aprons of drawing systems in textile spinning machines having a frame, comprising a tensioning stirrup having a transversely extending guide-member as well as a cross-member and a lateral opening for admitting the endless apron and being turnably mounted on a carrier bar extending longitudinally with respect to said spinning machines, said carrier'bar having a longitudinal groove, awide leaf spring extending substantially parallel with respect to the longitudinal edges of said stirrup, said leaf spring having a center portion as well as an inner and outer portion, and said center portion being curled and embracing'said carrier bar and'said inner portion being offset for engagement with said longitudinal groove and said outer portion bearing with tension on the crossmember of said stirrup in order to tension said stirrup and, thereby, said aprons. i 4. The tensioning device, as set forth in claim 3, wherein said carrier bar is mounted on said machines so as to be turnable about its axis and having levers rigidly mounted thereon, and each of said levers has a screw in threaded engagement therewith, the lower end of said screw abutting against said frame of the machines in order to, enable adjustment of the tensioning of said aprons.

5. The tensioning device, as set forth in claim 3, wherein said groove is formed by a longitudinally slotted tube tightly drawn on said carrier bar.

6. The tensioning device, as set forth in claim 3, wherein said stirrup has a roof-shaped cover extending over the center and outer end portions of said leaf spring so as to prevent collection of fly and dust thereon.

7. The tensioning device, as set forth .in claim 6, wherein said stirrup together with said guide member and said cross member and said roof-shaped cover is made integrally .of thermosetting plastics.

8. A device for tensioning the lower aprons of draw ing systems in textile spinning machines having a frame comprising a tensioning stirrup having a transversely extending guide member arranged therein and a rigid crossmember and being turnably mounted on a carrier bar extending longitudinally with respect to the spinning machine, a longitudinal groove in said carrier bar, a wide leaf spring extending substantially parallel with respect to the longitudinal edges of said stirrup, said leaf spring having a center portion as well as an inner and outer portion, and said center portion being curled and embracing said carrier bar and said inner portion being offset for engagement with said longitudinal groove and said outer portion bearing with tension against said crossmember of said stirrup in order to tension said stirrup and, thereby, said aprons.

9. A device for tensioning the lower aprons of drawing systems in textile spinning machines having a frame comprising a tensioning stirrup having a transversely extending guide-member as well as a cross-member and being turnably mounted on a carrier bar extending longitudinally with respect to said spinning machines, said carrier bar having a longitudinal groove, a wide leaf spring extending substantially parallel with respect tothe longitudinal edges of said stirrup, said leaf spring having a center portion as well as an inner and outer portion, and said center portion being curled and embracing said carrier bar and said inner portion being offset for engagement with said longitudinal groove and said outer portion bearing with tension on the cross-member of said stirrup in order to tension said stirrup and, thereby, said aprons.

References Cited in the file of this patent FOREIGN PATENTS 

